3. Evolution of payment systems
The first forms of incentive payments could be met in ancient times. As Ian Kessler noticed, in the 6th century BC the employees got their salary in the form of food, the quantity of which depended on the labor results. Then the period of Roman Empire can be allocated and its concept of “right labor price”, that is for the quantity of labor and after “ fair price” connected with the cost of product. The period of middle ages is characterized by continuation of formation of job- price system, for the farmers mostly. Some authors consider that in 16-18 centuries the rights for
property (raw materials) changed, which turned craftsmen into employees with the payment for each item. Thus, on the initial stage of the payment system development the foundation of modern job- price system of payment and some others is seen. Besides, the salaries were also given in the natural form.